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DC/DC 轉換器

LMR14203

現行

採用 SOT-23 封裝的 4.5V 至 42V、0.3A 降壓 DC/DC 切換穩壓器

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產品規格表

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open-in-new 比較替代產品
針腳對針腳的功能與所比較的裝置相同。
TPS560430 現行 4V 至 36V、0.6A 同步降壓 SIMPLE SWITCHER® 電源轉換器 Smaller footprint, FPWM and PFM option.
功能相同，但針腳輸出與所比較的裝置不同。
TPSM560R6H 現行 採用 5-mm x 5.5-mm x 4-mm QFN 封裝的 4.2-V 至 60-V 輸入、1-V 至 16-V 輸出、0.6-A 降壓模組 Smaller design with an integrated-inductor power module.

LMR14203

現行
產品規格表 立即訂購

產品詳細資料

Rating Catalog Topology Buck Iout (max) (A) 0.3 Vin (max) (V) 42 Vin (min) (V) 4.5 Vout (max) (V) 34 Vout (min) (V) 0.765 Features Enable, Overcurrent protection Control mode current mode Operating temperature range (°C) -40 to 125 Iq (typ) (A) 0.0013 Duty cycle (max) (%) 87
Rating Catalog Topology Buck Iout (max) (A) 0.3 Vin (max) (V) 42 Vin (min) (V) 4.5 Vout (max) (V) 34 Vout (min) (V) 0.765 Features Enable, Overcurrent protection Control mode current mode Operating temperature range (°C) -40 to 125 Iq (typ) (A) 0.0013 Duty cycle (max) (%) 87
SOT-23-THN (DDC) 6 8.12 mm² (2.9 mm × 2.8 mm)
  • Input Voltage Range of 4.5V to 42V
  • Output Voltage Range of 0.765V to 34V
  • Output Current up to 0.3A
  • 1.25 MHz Switching Frequency
  • Low Shutdown Iq, 16 µA Typical
  • Short Circuit Protected
  • Internally Compensated
  • Soft-Start Function
  • Thin SOT-23-6 Package (2.97 x 1.65 x 1mm)
  • Fully Enabled for WEBENCH® Power Designer

Performance Benefits

  • Tight Accuracy for Powering Digital ICs
  • Extremely Easy to Use
  • Tiny Overall Solution Reduces System Cost

All trademarks are the property of their respective owners.

  • Input Voltage Range of 4.5V to 42V
  • Output Voltage Range of 0.765V to 34V
  • Output Current up to 0.3A
  • 1.25 MHz Switching Frequency
  • Low Shutdown Iq, 16 µA Typical
  • Short Circuit Protected
  • Internally Compensated
  • Soft-Start Function
  • Thin SOT-23-6 Package (2.97 x 1.65 x 1mm)
  • Fully Enabled for WEBENCH® Power Designer

Performance Benefits

  • Tight Accuracy for Powering Digital ICs
  • Extremely Easy to Use
  • Tiny Overall Solution Reduces System Cost

All trademarks are the property of their respective owners.

The LMR14203 is a PWM DC/DC buck (step-down) regulator. With a wide input range from 4.5V-42V, it is suitable for a wide range of applications such as power conditioning from unregulated sources. They feature a low RDSON (0.9Ω typical) internal switch for maximum efficiency (85% typical). Operating frequency is fixed at 1.25 MHz allowing the use of small external components while still being able to have low output voltage ripple. Soft-start can be implemented using the shutdown pin with an external RC circuit allowing the user to tailor the soft-start time to a specific application.

The LMR14203 is optimized for up to 300 mA load current.

Additional features include: thermal shutdown, VIN under-voltage lockout, and gate drive under-voltage lockout. The LMR14203 is available in a low profile SOT-6L package.

The LMR14203 is a PWM DC/DC buck (step-down) regulator. With a wide input range from 4.5V-42V, it is suitable for a wide range of applications such as power conditioning from unregulated sources. They feature a low RDSON (0.9Ω typical) internal switch for maximum efficiency (85% typical). Operating frequency is fixed at 1.25 MHz allowing the use of small external components while still being able to have low output voltage ripple. Soft-start can be implemented using the shutdown pin with an external RC circuit allowing the user to tailor the soft-start time to a specific application.

The LMR14203 is optimized for up to 300 mA load current.

Additional features include: thermal shutdown, VIN under-voltage lockout, and gate drive under-voltage lockout. The LMR14203 is available in a low profile SOT-6L package.
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技術文件

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重要文件 類型 標題 格式選項 下載最新的英文版本 日期
* 資料表 SIMPLE SWITCHER 42Vin, 0.3A Step-Dwn V-Reg in SOT-23 datasheet (Rev. C) 2013/4/4
應用說明 Semiconductor and IC Package Thermal Metrics (Rev. D) PDF | HTML 2024/3/25
選擇指南 Power Management Guide 2018 (Rev. R) 2018/6/25
技術文章 Quantifying the value of wide VIN PDF | HTML 2016/6/15
技術文章 DC/DC converter datasheets – System losses demystified PDF | HTML 2016/4/25
技術文章 DC/DC converter datasheets – System efficiency demystified PDF | HTML 2016/4/18
應用說明 Low EMI Layout Made SIMPLE With LM43600/1/2/3 and LM46000/1/2 (Rev. A) 2014/9/12
應用說明 AN-2162 Simple Success With Conducted EMI From DC-DC Converters (Rev. C) 2013/4/24
應用說明 AN-1566 Techniques for Thermal Analysis of Switching Power Supply Designs (Rev. A) 2013/4/23
應用說明 AN-2155 Layout Tips for EMI Reduction in DC/ DC Converters (Rev. A) 2013/4/23
應用說明 AN-1229 SIMPLE SWITCHER PCB Layout Guidelines (Rev. C) 2013/4/23
應用說明 AN-1149 Layout Guidelines for Switching Power Supplies (Rev. C) 2013/4/23
應用說明 AN-1889 How to Measure the Loop Transfer Function of Power Supplies (Rev. A) 2013/4/23
應用說明 AN-1197 Selecting Inductors for Buck Converters (Rev. B) 2013/4/23
應用說明 AN-1246 Stresses in Wide Input DC-DC Converters (Rev. C) 2013/4/23
應用說明 AN-1520 A Guide to Board Layout for Best Thermal Resistance for Exposed Packages (Rev. B) 2013/4/23
應用說明 Input and Output Capacitor Selection 2005/9/19
更多文件說明 SEM1600 Topic 4: Constructing Your Power Supply – Layout Considerations 2005/7/12
應用說明 AN-643 EMI/RFI Board Design (Rev. B) 2004/5/3

設計與開發

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開發板

LMR14203XMKDEMO — LMR14203 Simple Switcher® 小體積 42V 降壓穩壓器 300 mA 展示板

The LMR14203/06 is a PWM DC/DC buck (step-down) regulator. With a wide input range from 4.5V-42V, it is suitable for a variety of applications from automotive to power conditioning of unregulated sources. The LMR14203/LMR14006 Evaluation Board is designed to provide the design engineer with a fully (...)

使用指南: PDF
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LMR14203X PSpice Average Model

SNVM220.ZIP (53 KB) - PSpice 模型
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LMR14203X PSpice Transient Model

SNVM219.ZIP (180 KB) - PSpice 模型
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LMR14203X Unencrypted PSpice Average Model

SNVM943.ZIP (1 KB) - PSpice 模型
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LMR14203X Unencrypted PSpice Transient Model

SNVM942.ZIP (2 KB) - PSpice 模型
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參考設計

PMP22339 — 適用伺服器電池備援充電的高電壓 800-W SEPIC 轉換器參考設計

此非連續導通模式 (DCM) 非隔離式 800-W SEPIC 轉換器電池充電器參考設計提供可調式輸出電壓及電流。若將外部 DC 電壓設在 0 V 至 3 V 間，即可將輸出電壓調整爲 282 V 至 400 V。若調整 PWM 輸入的工作週期，則可在 0 A 至 2 A 間調整輸出充電電流。其運作輸入電壓範圍為 340 Vdc 至 420 Vdc。採用獨立電壓與電流回饋迴路來維持調節。
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封裝 針腳 CAD 符號、佔位空間與 3D 模型
SOT-23-THN (DDC) 6 Ultra Librarian
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